Home / 128,181.90-192,272.85-78,318.30

Finding the Fourth Proportional to 128,181.90, 192,272.85 and 78,318.30

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Solution

The fourth proportional to 128,181.90, 192,272.85 and 78,318.30 is: 117,477.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,181.90 : 192,272.85 = 78,318.30 : x
  2. Step 2: Convert to fraction form
    128,181.90/192,272.85 = 78,318.30/x
  3. Step 3: Cross multiply
    128,181.90x = 192,272.85 × 78,318.30
  4. Step 4: Simplify right side
    128,181.90x = 15,058,482,748.16
  5. Step 5: Solve for x
    x = 15,058,482,748.16/128,181.90
  6. Step 6: Final answer
    x = 117,477.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.